GREASE RELEASE

Submitted to Community Café

So a friend just sent me these pictures, she found this in her fathers barn and wants to use in her kitchen. Leaving the bottom patena as is and poly the top. She has been trying to get the dark grease stains out of the wood, I know it's not all going to come out. I think if she can lift it some she could apply varathane walnut and make this piece look fabulous. Any ideas on how to lift the grease stains any? Thanks in advance